Custom fixtures parameters settings weird intensity functional

Hi Everyone, I am new in this room and I am struggling  with a Chinese mini wash 5X15W

after creating the fixture with the below dmx 14 ch  , the intensity parameter is weird...

even after setting 4 ranges as per the below table

at 0 the fixture is ON

at full it strobe

other functions such as color picker, Pan tilt, color changing is working

Thanks for your support

Oumar

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